levorotatory

also le·vo·ro·ta·ry (-tə-rē)
adj. (Symbol l-)
Of or relating to an optically active chemical that rotates the plane of polarized light to the left, or counterclockwise: Only levorotatory amino acids are biologically active.

(lē'və-rō'tə-tôr'ē) or le·vo·ro·ta·ry (-rō'tə-rē)
adj.

1. Turning or rotating the plane of polarization of light to the left.
2. Of or relating to a chemical solution that rotates such a plane to the left.

Turning the plane of polarization, or rays of light, to the left.

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The adjective has one meaning:

Meaning #1: rotating to the left
  Synonyms: levorotary, left-handed

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